[WebNFC] Mark API stable on Android

Updates runtime_enabled_features.json5 to mark the Web NFC API stable on
Android.

Intent to ship: https://groups.google.com/a/chromium.org/g/blink-dev/c/aoj06_plqPc

Bug: 520391
Change-Id: Ieaf7bef30c7eb3fa26e60f75c1bcd76d805c379d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584803Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#841962}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -2185,7 +2185,7 @@
     },
     {
       name: "WebNFC",
-      status: "experimental",
+      status: {"Android": "stable", "default": "test"},
     },
     {
       name: "WebOTP",